It was a mystery, but easily forgotten by the people of Japan. "Lemon Angel" was a once-popular band that frequently would show themself in the large monitors of downtown. However, the people of the band seemed to vanish. A year later, the same music company that formed Lemon Angel are holding auditions. The name for their organization is deemed "Lemon Angel Project". Minaguchi Tomo is a clumsy, whiny, but cheerful girl. She is asked to audition personally by a manager, but she hesitates. However, after a mishap with the company, the history of the original Lemon Angel slipped. Wanting to know more, Tomo auditions for the Lemon Angel Project. 2016年夏天,超人气美少女偶像团体“柠檬天使”的活动在没有任何征兆的情况下突然闭幕……